The relevance that you site has for keywords or expresions. And there are different keywords for helping you determine the keyword relevancy!
Keywords are the most important SEO element for every search engine, they are what search strings are matched against. Choosing the right keywords to optimize for is thus the first and most crucial step to a successful SEO campaign.It help for us a lot.
Keyword Relevancy is a term in SEO which show us how a specific keyword is relevant to a web-page (website). In other words, In keyword relevancy we check how many time a specific keyword has been used in content of a webpage and keyword should be used in with a proper sentence and 2-3 times in per 100 words. Yes, relevant keywords are most powerful elements to help search engine ranking.